A 12-year-old boy presents to the clinic with complaints of frequent urination, constant thirst, and weight loss despite a voracious appetite. Physical examination and laboratory tests were done and results are shown below. Use this information to answer questions 4-5. Physical Exams and Tests Results Normal Range Height 5 feet, 3 inches Weight 50 kg Percentage Adipose Tissue 30% Blood Pressure 90/55 Plasma Fasting Glucose 340 mg/dL 70-110 mg/dL Plasma Na+ 142 mEq/L 140 mEq/L Plasma BUN 9.5 mg/dL 10 mg/dL Urine Glucose 15 mg/dL 0-15 mg/dL Urine Na+ 280 mEq/L/day 15-250 mEq/L/day 4. The plasma osmolarity in this patient is: A) 290 mOsm/L B) 306 mOsm/L C) 312 mOsm/L D) 320 mOsm/L 5. The total body water in this patient is: A) 15 L B) 20 L C) 26 L D) 35 L
A 12-year-old boy presents to the clinic with complaints of frequent urination, constant thirst, and
weight loss despite a voracious appetite. Physical examination and laboratory tests were done and
results are shown below. Use this information to answer questions 4-5.
Physical Exams and Tests Results Normal Range
Height 5 feet, 3 inches
Weight 50 kg
Percentage Adipose Tissue 30%
Blood Pressure 90/55
Plasma Fasting Glucose 340 mg/dL 70-110 mg/dL
Plasma Na+ 142 mEq/L 140 mEq/L
Plasma BUN 9.5 mg/dL 10 mg/dL
Urine Glucose 15 mg/dL 0-15 mg/dL
Urine Na+ 280 mEq/L/day 15-250 mEq/L/day
4. The plasma osmolarity in this patient is:
A) 290 mOsm/L
B) 306 mOsm/L
C) 312 mOsm/L
D) 320 mOsm/L
5. The total body water in this patient is:
A) 15 L
B) 20 L
C) 26 L
D) 35 L
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